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master
src/lexical/shift.rs
46 строк
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David Tolnay
Eliminate lib module
31 дек 2021, 07:52
Не верифицирован
31 дек 2021, 07:52
5d2cbcd
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// Adapted from https://github.com/Alexhuszagh/rust-lexical. //! Bit-shift helpers. use super::float::ExtendedFloat; use core::mem; // Shift extended-precision float right `shift` bytes. #[inline] pub(crate) fn shr(fp: &mut ExtendedFloat, shift: i32) { let bits: u64 = mem::size_of::<u64>() as u64 * 8; debug_assert!((shift as u64) < bits, "shr() overflow in shift right."); fp.mant >>= shift; fp.exp += shift; } // Shift extended-precision float right `shift` bytes. // // Accepts when the shift is the same as the type size, and // sets the value to 0. #[inline] pub(crate) fn overflowing_shr(fp: &mut ExtendedFloat, shift: i32) { let bits: u64 = mem::size_of::<u64>() as u64 * 8; debug_assert!( (shift as u64) <= bits, "overflowing_shr() overflow in shift right." ); fp.mant = if shift as u64 == bits { 0 } else { fp.mant >> shift }; fp.exp += shift; } // Shift extended-precision float left `shift` bytes. #[inline] pub(crate) fn shl(fp: &mut ExtendedFloat, shift: i32) { let bits: u64 = mem::size_of::<u64>() as u64 * 8; debug_assert!((shift as u64) < bits, "shl() overflow in shift left."); fp.mant <<= shift; fp.exp -= shift; }